First time replacing black ink, now says does not recognize it, I removed it, replaced it,
same thing. I removed and replaced the existing color ink (which was ok) and now it
is telling me don't recognize it! help!

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I had the same problem. My mp630 is also only 4 months old. I replaced all colour ink cartrdiges(inc black), but was only able to release the function for detecting the ink levels for magenta and cyan. Yellow and black then started giving error message U043, with them alternating between working, but never working at the same time. Getting them all clicked in with the lights glowing red does not solve the problem, as once the printer cover is closed, the same error message turns up. The only thing that worked for me is moving the chip slightly out of alignment, by pushing the sliding chip holder, and I only had to do this twice before they all started working and the printer was unlocked.

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The Brother MFC-240C uses an individual cartridge for each color (black, yellow, cyan, and magenta). When one of the cartridges is empty or near empty, the printer will tell you to replace that ink cartridge.

You can buy the cartridges individually, or you can buy a pack of all three color cartridges or a pack of two black cartridges. To replace one of the ink cartridges, follow the steps below. All four of the cartridges are located on the right front side of the printer, behind a gray plastic cover. Pull the cover forward from the side, where there is a slight cutout for your finger to grab. When the cover falls forward, you'll see the four ink cartridge holders, coded by color.

For the ink cartridge that you need to replace, push down on the purple handle for that color. The ink cartridge holder will open and fall forward, revealing the ink cartridge itself. Push down on the cartridge holder and the cartridge should pop out toward you a little bit. Grasp the cartridge and remove it.
Open the new cartridge and remove it from its wrapper. Discard the yellow cover, unless you plan to use it for the old cartridge.

Insert the new cartridge into the correct slot (from left to right, they go black, yellow, cyan, magenta) so that the word "brother" is right-side up and located toward the top of the cartridge. Once the cartridge is most of the way in, push the ink cartridge holder up by the purple handle until it snaps into place.

If you are replacing more than one color, repeat this procedure for each cartridge. Then, when you are finished, close the ink cartridge cover.

If you were out of ink or low on ink, the machine should recognize the new cartridge and perform the calibration process. If it doesn't automatically recognize the new cartridge, it will ask if you have changed one or more of the cartridges. Press "1" for Yes when it asks about a color that you replaced, or "2" for No if it asks about a color you didn't replace.

Once the printer comes back up to the ready state, print a color test page to verify that everything is working. If the test page comes out okay, the new cartridge is fine and you can either discard the old cartridge in the trash or save it to recycle. (But don't get rid of it before you are sure that the new cartridge is recognized and working correctly.)

Title:
I replaced my ink cartridge, but the LCD is still displaying "Ink Empty". What can I do?
Description:
This is typically caused by an incorrect selection made during the LCD prompting after a cartridge is replaced. When an ink cartridge(s) is replaced, the LCD will ask, "Have you removed Blck? 1 Yes 2 No". This question will be asked for ALL 4 colors in sequence, regardless if the color was replaced. If "1 Yes" is NOT selected for the color(s) that was replaced, the LCD will return to "Ink Empty". Do the following to clear the message:

Pull the scanner cover release lever located below the control panel and lift the top cover.

After 15 seconds, re-close the top cover and then re-close the control panel cover.

The LCD will then display Have you removed Blck? 1 Yes 2 No.The LCD will display this question for ALL 4 colors (not just the ones replaced). BE SURE to select 1 YES for each ink cartridge that was replaced.If 1 Yes is selected, the LCD will then display Change to new (color)? 1 Yes 2 No. Again, BE SURE to select 1 YES.

Note
"Change to new (color)?" will only appear if 1 Yes is selected for "Have you removed (color)?" If 2 NO is selected for the "removed" question, the LCD will then move on to the question for the next color.

I had the same problem. My mp630 is also only 4 months old. I replaced all colour ink cartrdiges(inc black), but was only able to release the function for detecting the ink levels for magenta and cyan. Yellow and black then started giving error message U043, with them alternating between working, but never working at the same time. Getting them all clicked in with the lights glowing red does not solve the problem, as once the printer cover is closed, the same error message turns up. The only thing that worked for me is moving the chip slightly out of alignment, by pushing the sliding chip holder, and I only had to do this twice before they all started working and the printer was unlocked.

try cleaning the contacts (bronze like) with dry cloth both the cartridge and the cartridge holder most of the times there exist some liquid forms on both areas.
since you frequently remove the cartridges; their might be a broken part on the cartridge holder. the broken part, use, is to make sure the cartridge is in absolute contact with the cartridge holder's. the size the said broken part is 2 mm in all sides. so small that it has a big function.you dnt even recognize.